Radiation measurement

i'm trying to find a way to measure the absorbed radiation by an object. best thing to do could be an "invisible" light on the radioactive emitting object. that light should be able to pass through anything, but getting attenuated each time based on the thickness of the material, just like a normal light that pass through a partially trasparent material. the receiving object should be able to sum all received radiation from each emitted object.

do you think it is possible? what is the best way to implement something like this?